package com.atguigu.gulimall.product.service.impl;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.atguigu.common.utils.PageUtils;
import com.atguigu.common.utils.Query;

import com.atguigu.gulimall.product.dao.CategoryDao;
import com.atguigu.gulimall.product.entity.CategoryEntity;
import com.atguigu.gulimall.product.service.CategoryService;


@Service("categoryService")
public class CategoryServiceImpl extends ServiceImpl<CategoryDao, CategoryEntity> implements CategoryService {

	@Autowired
	private StringRedisTemplate redisTemplate;

	@Override
	public PageUtils queryPage(Map<String, Object> params) {
		IPage<CategoryEntity> page = this.page(
				new Query<CategoryEntity>().getPage(params),
				new QueryWrapper<CategoryEntity>()
		);

		return new PageUtils(page);
	}

	@Override
	public List<CategoryEntity> listWithTree() {

		//查询所有分类列表
		List<CategoryEntity> categoryEntityList = baseMapper.selectList(null);

		//收集一级分类
		List<CategoryEntity> entities = categoryEntityList.stream().filter((categoryEntity) -> {
			return categoryEntity.getParentCid() == 0;
		}).map((menu) -> {
			// 映射子分类
			menu.setChildren(getChildrens(menu, categoryEntityList));
			return menu;
		}).sorted((menu1, menu2) -> {
			return (menu1.getSort() == null ? 0 : menu1.getSort()) - (menu2.getSort() == null ? 0 : menu2.getSort());
		}).collect(Collectors.toList());

		return entities;
	}

	@Override
	public void removeMenuByIds(List<Long> asList) {
		//TODO 1、检查当前菜单是否被引用

		//批量删除
		baseMapper.deleteBatchIds(asList);
	}

	public List<CategoryEntity> getChildrens(CategoryEntity root, List<CategoryEntity> all) {

		List<CategoryEntity> childrens = all.stream().filter((categoryEntity) -> {
			// 过滤出子分类
			return root.getCatId().equals(categoryEntity.getParentCid());
		}).map((menu) -> {
			menu.setChildren(getChildrens(menu, all));
			return menu;
		}).sorted((menu1, menu2) -> {
			return (menu1.getSort() == null ? 0 : menu1.getSort()) - (menu2.getSort() == null ? 0 : menu2.getSort());
		}).collect(Collectors.toList());
		return childrens;
	}
}